Air Filter, Filter Type Pleated, Performance Rating MERV 17, Actual Depth 2 in, Actual Height 15 13/16 in, Actual Width 19 in, Compatible Grainger Part Number 56GX66, 56GY10, 56GY11, Compatible Manufacturer Model Number AS-PF, Number of Filters 2, Media Material Fiberglass, Nominal Depth 2 1/2 in, Nominal Height 16 1/4 in, Nominal Width 18 1/2 in, Filters Down To 0.3 micron, Filters Out Allergens, Asbestos, Mold, Filter Efficiency 99.97 Percent, Air Flow @ 300 fpm 360 cfm